Furnace



@et 2 T1923.

T. TEISEN' FURNACE Filed July 14 1920 lLr T T S Patented @cih 2, 1923,.

ear-'arr remmen.

' Application led July M, 1920. Serial No. 896,253.

vented certain new 'and useful Improvementsv Relating to Furnaces, of which the follow- 1s a specification.

` ing.1

, his invention relates to furnaces such as at intervals with the chamber.

annealing furnaces of akind in which the articles or materials to be treated are passed through a long chamber in which they are first heated and afterward cooled.

The object of the invention is to provide convenient and reliable mea-ns whereby any desired temperature regulationcan be obtained along the said chamber.

The invention comprises the arrangement beneath the floor of a long chamber through or around which pass 4the hot gases and through which pass the goods to be treated,

of a collecting Hue or'flues communicating Also the inventiQn comprises the combination with the aforesaid arrangement, of other featuresito be hereinafter referred t0.

Referring to the accompanying sheet of explanatory drawings Y Figure l is a section side elevationand Figure 2 a sectional plan of a gas tired furnace, kiln, or lehr, as constructed in accordance with this invention and adapted for the annealing of glass ware.

Figure 3 is a sectional view of the furnace.

The same reference letters in the different views indicate the same or similar parts.

In the examplel illustrated a long chamber a is adapted at one vend to be heated by gas from a producer as b built beneath the furnace. At intervals ,along the chamber a, outlet passages c are providedin connection with a common collecting flue d 'arranged longitudinally below the level of the chamber. If desired, two or more collecting lues may be used. The outlet pas-v sages c may open into the sides or bottom of the chamber a, and dampers arel employed to control the flow of Jhot g'ases through them.j The collecting lues or flue asd communicate with the chimney stack by one or more branchiues'as ,e,,and the -iowjof' gases through these branch 'flues can be regulated by dampers. By this construct-ion, hot waste gases can be withdrawn the furnace.

the chamber, while the cold air passing `in from the left hand or exit end f of the furnace is prevented from causing a too sudden drop in temperature' at any point; consequently, a gradual temperature gradient can be obtained within the chamber L l, and thisgradient can be varied by ad- ]ustlng the outflow of the hot waste gases through the outlet passages 0 and branch lues e. urther in addition to obtaining; any .desired temperature gradient my invention enables me to ensure a uniform distribution of heat over the cross section of The .portion g at the right of the furnace, immediately above the gas producer b, constitutes the heating chamber; the tunnel or chamber a aforesaid is an extension of such heat-ing chamber. y

The gases pass through flues as h direct to ports situated in the upper parts of the side wallsv of the heating chamber g where they are enabled to mix with sutlicient air to complete the combustion, or they pass into a combustion Chamber or chambers, .asy distinct from the heating chamber, where they are 'enabled to mix with the air necessary forv combustion before they reach the ports opening into the heating chamber.

To ensure that the secondary combustion shall be perfect and the resulting temperature in the heating chamber g suflciently high, it is advisable that the air required for combustion should be preheated, and this can be effected by drawi passages situated in c ose proximity it in through throughout their length to the aforesaid ing the air, the latter arrangement increases y its speed and so, by facilitating'the mixing together of the air and gas, assists the secondary combustion. The air passages are not shown in the drawings. rlhesemay be provided in any suitable manner as above described.

Dampers are arranged 1n the secondary air flues and in the gas fluesto enable the temperature in the heating chamber g to be controlled throughout its length.

rlhe articles to be heated may be carried on an endless conveyor belt, chain of pans, or cars passing through the chamber. An endless conveyor -z' is shown atv Figure 1 of the drawings, adapted to carry the goods through the furnace from the entrance at j at the right hand end of the furnace to the exit f 'at the opposite end. In returning from the exit to the entrance end of the furnace the conveyor passes beneath the chamber a as illustrated. rllhe entrance and exit are each fitted with a door arranged in an suitable manner.

, t will be understood that the glass ware is raised to the desired maximum temperature as it passes on the conveyor i, through the heating chamber g. From the heating chamber thelgoods are carried by the conveyor through the chamber a forming an extension of g as aforesaid, and during transit through a 4are exposed to the hot waste gases which pass from g to aand thence to the collecting flue al as previously described. Such waste gases cool towards the exit end of a and thus the goods their selves are subjected to a gradual cooling eiect as is required in the annealing process.

By suit-able adjustment of the various dampers the fall in temperature along the cooling chamber a ma be varied to suit the type of glassware un er treatment. lt is a well-known fact that `in all annealing processes the fall in temperature from the maximum to a. given critical point must take place at a certain maximum rate (varying with the nature of the goods dealt with) if i the goods are to be properly annealed. VBelow this particular temperature the rate of cooling may be considerably increased without damage to the goods. With my furnace it is possible 'to so grade the temperature throughout the cooling chamber a that in the first place or for so long as they remain above the critical temperature the goods shall not be too rapidly cooled while as Soon as they have passed this point the rate of cooling may be increased by mea-ns of air drawn in at the exit end of the chamber.

The inventionis applicable to furnaces of various kinds other than annealing furnaces. through the chamber a in direct contact with the hot gases, a long muiile may be employed, the articles being passed through the mutlie out of contact with the gases which surround the inutile. Further, the furnace may be heated in any convenient manner. Instead of gaseous fuel, pulverized or liquid fuel may be used.

vHaving thus described my invention what l claim as new and desire to secure by Letters Patent is 1. In furnaces, kilns or lehrs, the combinationcomprising a long horizontal cooling chamber through which are conveyed the articles t0 be treated, a collecting flue lo-.

cated beneath the floor of the chamber, a plurality of passages arranged at in-tervals in the side walls of the said chamber with their inlet ends yat a distance above the floor of the chamber and located between the chamber. and collecting lue, andl a branch outlet flue for discharging hot gases from the collecting flue, substantially as described.

2. ln furnaces, kilns or lehrs, the combination comprising a horizontal cooling chamber through which -are conveyed the articles to be treated, a. collecting flue 1ocated beneath the floor of the chamber, a plurality of passages arranged at intervals in the side walls of the said chamber with their inlet ends 4at a distance above the floor of the chamber and located between the chamber and collecting Hue, and a plurality of branch outlet flus for discharging hot gases from the collecting flueat different positions along the collecting flue, substantially as described.

In testimony whereof I have signed my name t0 this specification.

THEODOR TEISEN.

Also instead of the articles passing` 

